Brake-shoe.



G. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912.

Patented June 24, 1913.

4 SHEETS-SHEET 2.

&Ma 04 C. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG.3, 1912.

Patented June 24, 1913.

4 SHEETS-SHEET 3.

C. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912.

Patented June 24,1913. 4 SHEETSYSHEBT 4.

. UNITED STATES,

PATENT OFFICE.

CLIFTON D. PE'I TIS, OF CHICAGO, ILLINOIS.

BRA E-SHOE.

Specification of Letters Patent.

Patented ane24,1913.

Application filed August 3, 1912. Serial No. 713,177.

\ of which]. do declare the following to be a full, clear, and.exact description, reference being had to the accompanying drawings, forming part of this specification.

This invention relates more particularly to that class of brake shoes for railway cars in whi h-provision is made for strengthen. ing the backs of the shoes, so that as the. cast metal bodies of the shoes become worn in service, the danger of the breakage of the shoes or their falling away from the brake head will be obviated. I i The invention consists in the features of novelty hereinafter described illustrated-in the accompanying drawings and particularly pointed out. in the claims at the end of this specification. s

Figure l is a view of the. blank from which. my improved form of reinforcing back for the shoe will he made. Fig. 2 is aiiend view upon an enlarged scale of the blank after it has been folded. but showing the folds separated for better illustration. ,Fig. 3 an inner face' view of the blank after the body completely folded and punched to .form the holes for admitting the attaching lugs and with holes for permitting the .cast metal to be poured into the back or shell. Fig. 6 is a view similar to Fig. 5 but .showing the parts after the attaching lugs have been connectcd thereto. Fig. 7 is a view in side elevation of the completed shoe. Fig. 8 is a view in cross section upon an enlarged scale on line S- 8 of Fig.7 Fig. 9 and Fig. 10 are detail views in elevation of the central attaching lug. Fig. 11 is a view in cross section, upon an enlarged scale, on line 11-11 of Fig 7. Figs 12 and 15 are. detail views in elevation of one of the end lugs. Fig. 14 is an enlarged view in central longitudinal section on lines 1 t-14 of Fig. 11. Fig. 15 is an end view showing a slightly modified form of reinforcing back. Fig. 16 is a view of a blank for forming a modified form of reinforcing back embodying features of my invention.

face view and Fig. 18 a view in side elevation of a back made from the blank shown in Fig. 16 before the ends have been folded. Fig. 19 is an inner face view of the modified form of back after its ends have been folded and the back has been punched and after the separate end plates have been connected thereto and the ductile metal of the center tent siown in Figs. 17 and 18. Fig. 23' is a.

view in cross section on line-23 2?; offF g. '21. Fig; '24 is a view in crosssectionoii lino A -24 of Fig-91. Fig. 35 is a detaihper spective view (frointhe inner side) of; the reinforcing back after it hasbeen folded and punched. Fig; 26 isa detail perspective view of one of the end lug s with-theend 8 and 11, the cast metal body ofthefshoe is indicated in dotted lines.

in the casting operation. "In the"embodiment of the invention shown upon Sheets 1 and 2 of the drawings. the reinforcing back is formed from a ductile metal plate cut in theshape of the blank shown in Fig. land subsequently folded, as will presently appear. The blank shown in Fig. 1 comprises a central portion 30 from which project the end portions 31, preferably formed with Fig. 1 will be folded, upon the dotted lines indicated, to form the plies or sections 34,

and-t0 form the corresponding plies or layers34, 35, 36* and 37' and side wall 38 on the opposite side of the central po'rtion 30. )At the end of the walls or sect-ions 38 and 38 are formed the lips or projections 39 and 39. blank shown in Fig. 1 will first'be folded longitudinally, as shown in Figs. 2, 3 and 4 of the drawings. That is to say, the section 34 will be. turned in toward the center of the back, the section 35 bent, outwardly, and the sections 36 and 37 will be folded in between the sections 34 and 32'), 9 after which the section 38 will be turned at Fig. 17 is an inner i right angles to the section 37. Similarly,

projecting tongues 32. The blank shown in V In forming the back, the

plate formed in piecetherewith. -In F gs." I

The body portion A of my?improvedbrake; I shoe is [)l'cfeiflblYfOllilBd of cast metal, 't-o 1 which body the reinforcingback. is united 35, 36' and 37 and side wall 38 1110119, side distended, as shown in Figs: 3 and 4. It

will be understo'od,-of course, that after the sections have been folded, as indicated in Fig. 2, the top and the sections'34, 35, etc.. will be rolled or compressed firmly to gether, after which the end portions 31 will be turned at substantially right angles to the central section 30, and the 'lips 39 and 39 will be folded at right angles to the end portions 31 and pressed'thereon. If desired, the lips 39 and 39 may be electrically or otherwise welded to the end portions 31. The reinforcing back will then be in the form shown in Fig. 5 of the drawings.

I prefer to use with my improved reinforcing back the form of center lug described and claimed in application, Serial No. 711,304, filed by me in the United States Patent Office, July 24, 1912, and I prefer to employ end lugs such as are described and claimed in an application, Serial No. 711,305, filed by me in the United States Patent Office, July 24, 1912, although, obviously, my improved reinforcing back may be employed in connection with center and end lugs of any suitable construction. I do not wish to be understood as claiming in the present application the specific construction of attaching lugs set forth in said above mentioned applications.

\Vhcn attaching lugs,-such as set forth in my above mentioned application, are used, the reinforcing back will be formed about its center with slots or holes 40, 40 and 41, 41, and adjacent its ends with slots or holes 42, 43, 44 and 45. The back will also be formed with holes 46 through which will be poured the cast metal whereof the body of the shoe will be formed.

My improved center lug, as shown in Figs. 9 and 10 of the drawings, comprises a crown 50 from which depend side walls 51, from which project brace walls 52, between which brace walls extend the base portions 53. From the side walls 51 extend the locking members 64 that are providedwith slots adjacent their ends. and from the base portions 53 depend the locking members 56. In attaching the center lug to the back, the locking member-s54 will be passed through the slots 40 and the locking members 56 will be passed through the slots 41 of the back, after which the locking mem bers 54 will be turned outwardly, the looking members 56- will be passed through the holes in the locking members 51 and the free ends of the locking members 56 will be bent inwardly, as shown in Fig. 8 of the drawings.

Each of the end lugs is shown as comprising a transverse wall 60 from which projects inwardly a central portion 61. From the central portion of the transverse wall 60 extends a locking member 62, and on opposite sides of the locking member 62 are the locking members 63 and 64.v From the inner end of the central portion 61 of the lug extends. the looking member 65. A slot 66 is formed in the locking member 62 adjacent its free end. In applying each of the end lugs to the reinforcing back of the shoe, the locking members 62, 63, 64 and will be inserted through the slots or openings 42, 43, 44 and 45 of the reinforcingback, after which the locking member 62 will be benttoward the center of the shoe, the locking members 63 and 64 will be bent laterally, the locking member 65 will be passed through the slot 66 of the locking member 62, and its free end will be bent inwardly, as shown in Fig. 14 of the drawings. In Fig. 6 the reinforcing back is shown after the attaching lugs have been fixed thereto, in manner last described.

After the attaching lugs have been con nected to the reinforcing back, the back will be placedwvitliin a shallow mold upon the bottom of which the tongues 32 will rest. The cast. metal of which the body portion A of the shoe is to be formed, will then be poured through the openings 46 in the back and will fill the shallow pan that comprises the back. Preferably, the side and end walls of the back will extend more than half way from back to front of the body of the shoe and in the preferred form of the invention to a slight distance from the wear-- ing face of the body of the shoe. The ductile metal plate of which the reinforcing back or shell of the shoe is formed will be a thin plate (preferably about J- nd of an inch in thickness) and, when the cast metal is poured into the shell, it will firmly adhere to and coalesce therewith so that the shell forms in effect a tough skin or armor about the top and side and end portions of the cast metal body of the shoe. At the same time the cast metal flows about and adheres to the ends of the locking members of the attaching lugs'and effectively serves to guard against any pos ibility of the \vit lulrawal of the lugs. It will be understood that after the reinforcing back has been brought to the shape shown-in Figs. ,3 and 4 of the drawings, it will, by means of a suitable press, be given the requisite longitudinal curve, as shown in Fig. 7.

, In Fig. 15 of the drawings 1 have shown a slightly modified form of the reinforcing back. This form differs from that hereinbefore described only in the particular that the sections 35 and 36 and 35 and 36 are made somewhat wider, so that. they may be bent downwardly, as shown at 36". The purpose of this construction is to give a channel-like interior surface to the inner face of the back and thereby increase its strength.

In the modified form of the invention illustrated on Sheets 3 and 4 of the drawings, the main body of my improved reinforcing back is formed from the blank shown in Fig. 16 of the drawings. This blank comprises a central portion 30 that will be folded to form the sections or plies 34 35", 36",'37" and wall 38 on one side and corresponding sections or plies 34, 35, 36, 37 and wall 38 on the opposite side of the central section or portion 30*. The outer sections 38 and 38 will be formed at their ends with lips 39 that will be folded to form reverted flanges 39, as shown in Figs. 19 and 25 of the drawings. In making this modified form of my improved reinforcing back, the ductile metal blank shown in Fig. 16 will be folded upon the dotted lines there shown, so that the several sections or plies shall rest one upon the other, as clearly indicated in Fig. 22 of the drawings, the sections 38 and 38 forming the side walls of the back or shell extending at right angles to the sections 37 and 37. The back will then be in the form shown in Figs. 17, 18 and 22 of the drawings, after which the lips 39 will be bent to form the reverted flanges 39, as shown in Fig. 19. The ends of the back or shell in this modified form of my invention are shown as formed of ductile metal plates (see Figs. 19 and 26) that are integral with the transverse walls of the end lugs of the shoe. Each of these transverse walls (see Fig. 26) is preferably formed of two thicknesses 71 and 72 of ductile metal folded one upon the other, as shown in Fig. 26, to form the arched wall extending from side to side of the shoe. At each side of each of the end plates 70 is formed a channel shaped flange 74 adapted to interlock with the reverted flange 39 (see Figs. 19 and 25) at the ends of the side walls or sections 38 and 38 a d, preferably, each of the end lates 70 is formed with a tongue 75 adapte to rest uponthe bottom of the mold when the back or shell is set therein.

The central portion of my improved reinforcing back is formed with cut-away spaces adapted to permit the cast metal to flow therethrough in forming or reinforcing the center lug of the shoe. Preferably, the center lug comprises a ductile metal, U-shaped part 82, the side walls of which will extend through the openings 80 in the back, the free ends 83 of this lug being turned inwardly to engage the back and prevent the withdrawal of the lug. The side walls of the center lug 82 (see Figs. 21 and 23) will be reinforced by bodies 84 of cast metal integral with the body portion A of the shoe. The end portions of the back, shown on Sheets 3 and 4, are formed with openings 88 through which cast metal will flow, as at 89 (see Fig- 21) into the hollow, transverse wall 71 of the end lug and \vill flow also at the inner side of the central portion of the end lug to form {he inwardly extending member 90 of the It will be understood that the center lug 82 and the end plates 70 and end lugs will be attached to the body portion of the back or shell, as shown in F ig. .19, before the back or shell is placed within the mold. When the cast metal is poured into the mold, it will firmly unite with the back or shell and will interlock with the ends 83 of the center lug. as well as flow around and adhere to the side walls of such lug. So, also, at the ends of the shoe, the cast metal will adhere to the end plates and end lug and rigidly hold these parts against possibility of displacement.

I wish 'it understood that the details of construction above set out lnav be varied without. departing from the spirit of the invention, and that features of the invention may be employed without its adoption as an entirety- Thus, while I have shown the reinforcing back as formed of five plies or sections of thin ductile metal, it is obvious that the number of plies and their shape and extension may be varied without departing from the spirit of the invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. A brake slice comprising a body having a reinforcing back formed of a plurality of plies of ductile metal, one of said plies exilending outside the back surface of said he y.

2. A brake shoe comprising a body having a reinforcing back formed of a plurality of plies of ductile metal plate integrally connected together and arranged one ply above another. the outermost ply extending across the back of the body.

3. A brake shoe comprising a body haviug a reinforcing back formed of a plurality of plies of ductile metal folded one ply upon another and having integral walls.

4. A brake shoe comprising a body having 115 a reinforcing back formed of a plurality of plies of ductile metal folded one upon another lengthwise of the back, the outer one of said plies extending completely across less width than said outer plyand bent in opposite directions.

7. A brake shoe comprising a body having a reinforcing back formed of a plurality of plies of ductile metal folded one upon another and having integral side walls extending outside the body of the shoe, certain of said plies extending inwardly and at sub-- stantially right angles to said side walls and others of said plies extending above and below said plies that extend inwardly from said side walls.

8. A brake shoe comprising a body having a reinforcing backformed of a plurality of plies of ductile metal folded one ply upon another, the outermost ply extending across the center of the body and the inner plies extending to approximately the center of the body, said outermost ply and said inner plies being connected at their outer edges.

9. A brake shoe comprising a reinforcing, pan-shaped back having integral side walls, the portion of the back extending over the body of the shoe being formed of integral, plural plies of ductile metal.

10. A brake shoe comprising a body having a reinforcing back formed of a plurality of plies of ductile metal, the several plies having holes throughwhich the portions of the center attaching lug extend.

11. A brake shoe having a reinforcing back formed of a plurality of plies of ductile metal folded one ply upon another, said back having holes through which pass portions of the end lugs.

12. A brake shoe comprising a body having a reinforcing back formed of a plurality of plies of ductile metal folded one ply upon another and extending lengthwise of the shoe, said back having integral side walls with lips or flanges at their ends to engage the end walls of the back.

13. A brake shoe comprising a body having a reinforcing back formed of a plurality of superposed plies of ductile metal and having center and end-lugs interlocked with said back.

14. A brake shoe comprising a body having a pan-shaped, reinforcing back provided with side walls, the port-ion of the back extending across the body of the shoe being materially heavier than the side walls.

15. A brake shoe comprising a body hav ing a pan-shaped, reinforcing back formed of a plurality of plies of thin ductile metal, the side walls of the back being materially thinner than the aggregate thickness of the plies extending across the body of the shoe.

16. A brake shoe comprising a body having areinforcing back formed of a plurality of plies of ductile metal folded one ply upon another and having integral side walls, the innermost plies having downwardly turned, outer edges.

17. Abrake shoe comprising a body having a pan-shaped, reinforcing back with side and end Walls of thin metal extending more than half Way from back to front of the body of the shoe, that portion of the reinforcing back extending across the back of the shoe being materially thicker than the side walls of said reinforcing back.

CLIFTON D. PETTlS.

\Vitnesses GEO. P. FISHER, KATHARINE GERLACH. 

